fedia login error on some threads

when loading these pages:

I get this error:

500 Server error

why is that? other threads loads without issues.
how to fix?

thanks.

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3 comments

Sounds like the database of the instance is getting overloaded and the web server is returning 500
- maybe you're right, but I'm trying to load those threads since many days!
  and other threads loads properly.
  could it be some configuration error?